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.\" ========================================================================
.\"
.IX Title "png2pdf 1"
.TH png2pdf 1 "2006/07/18" "1.0.12a" "png2pdf-1.0.12a"
.SH "NAME"
png2pdf \- PNG to PDF converter
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
png2pdf \fIoptions\fR \fIinputfile\fR \fIoutputfile\fR
.PP
png2pdf \fIoptions\fR \fIdirectory\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The png2pdf program converts images from the \s-1PNG\s0 file format to the
\&\s-1PDF\s0 file format. Different \s-1PDF\s0 levels can be choosen for output.
An alpha channel in the \s-1PNG\s0 file can be used \*(-- depending on the
output \s-1PDF\s0 level \*(-- to mix the \s-1PNG\s0 image against a specified
background color, to create a \s-1PDF\s0 image mask or to create a
transparency channel in the \s-1PDF\s0 file.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-p\fR \fIpdf-level\fR" 4
.IX Item "-p pdf-level"
chooses the \s-1PDF\s0 format level, may be either \*(L"1.2\*(R", \*(L"1.3\*(R" or \*(L"1.4\*(R".
.IP "\fB\-n\fR" 4
.IX Item "-n"
adds an entry to the \s-1PDF\s0 image dictionary suggesting \s-1PDF\s0 viewers
to show an interpolated image. This is useful for stretched images
(small images shown in a large screen area).
.IP "\fB\-m\fR \fIbackground-rgb\fR" 4
.IX Item "-m background-rgb"
specifies a background \s-1RGB\s0 color for mixing. This background color
is used only if the \s-1PNG\s0 file does not contain a background chunk
or  if the \fB\-s\fR option is used.
.IP "\fB\-s\fR" 4
.IX Item "-s"
assigns the \s-1RGB\s0 background color specified using the \fB\-m\fR option
a higher priority than the background color from the \s-1PNG\s0 background chunk.
.IP "\fB\-i\fR" 4
.IX Item "-i"
converts the alpha channel from the \s-1PNG\s0 file into an image mask
(if there is an alpha channel).
.IP "\fB\-a\fR" 4
.IX Item "-a"
converts the alpha channel from the \s-1PNG\s0 file (if present) into a
\&\s-1PDF\s0 transparency channel. Note: \fB\-a\fR and \fB\-i\fR can not be used
at same time.
.IP "\fB\-l\fR" 4
.IX Item "-l"
inverts the triggering level for image mask creation (see \fB\-i\fR).
By default only opacity=0 pixels are masked. Using \fB\-l\fR the
opacity<255 pixels are masked.
.IP "\fB\-t\fR" 4
.IX Item "-t"
interprets the alpha channel data as transparency (by default it
is opacity).
.IP "\fB\-f\fR" 4
.IX Item "-f"
activates ``make'' style behaviour (checks file modification times)
when png2pdf is run on a directory.
.IP "\fB\-h\fR" 4
.IX Item "-h"
prints a help text
.IP "\fB\-v\fR" 4
.IX Item "-v"
prints version information.
.IP "\fB\-c\fR \fIoption\fR" 4
.IX Item "-c option"
stores permanent options.
.IP "\fB\-u\fR" 4
.IX Item "-u"
removes all permanent options.
.IP "\fB\-r\fR ..." 4
.IX Item "-r ..."
ignores all permanent options for this one program invokation. The
\&\fB\-r\fR options must be used before any other option.
.IP "\fB\-C\fR" 4
.IX Item "-C"
shows the permanent options.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
The program returns exit code 0 on success, positive values on error.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.Vb 1
\&  png2pdf -m 255.255.255 x.png x.pdf
.Ve
.Sp
converts x.png to x.pdf. If there is an alpha channel in x.png this
is used to mix against either the background specified in the
background chunk (if there is one) or against the user specified
background color white.
.Sp
.Vb 1
\&  png2pdf -s -m 255.255.255 x.png x.pdf
.Ve
.Sp
converts x.png to x.pdf. If there is an alpha channel in x.png this
is used to mix against the user supplied background color (white).
The background chunk possibly contained in the \s-1PNG\s0 file is ignored.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
By default a \s-1PDF\s0 manual is installed ``near'' with the binary.
If
.Sp
.Vb 1
\&  which png2pdf
.Ve
.Sp
finds the binary ``/usr/local/bin/png2pdf'', check for a file named
``/usr/local/share/doc/png2pdf/png2pdf.pdf''.
.SH "AUTHOR"
.IX Header "AUTHOR"
Dirk Krause
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2001\-2005, Dirk Krause
All rights reserved.
.Sp
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
.RS 4
.IP "* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer." 4
.IX Item "Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer."
.PD 0
.IP "* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution." 4
.IX Item "Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution."
.IP "* Neither the name of the Dirk Krause nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission." 4
.IX Item "Neither the name of the Dirk Krause nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission."
.RE
.RS 4
.PD
.Sp
\&\s-1THIS\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1PROVIDED\s0 \s-1BY\s0 \s-1THE\s0 \s-1COPYRIGHT\s0 \s-1HOLDERS\s0 \s-1AND\s0 \s-1CONTRIBUTORS\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R" \s-1AND\s0
\&\s-1ANY\s0 \s-1EXPRESS\s0 \s-1OR\s0 \s-1IMPLIED\s0 \s-1WARRANTIES\s0, \s-1INCLUDING\s0, \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0, \s-1THE\s0 \s-1IMPLIED\s0
\&\s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0 \s-1AND\s0 \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0 \s-1ARE\s0
\&\s-1DISCLAIMED\s0.  \s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1SHALL\s0 \s-1THE\s0 \s-1COPYRIGHT\s0 \s-1OWNER\s0 \s-1OR\s0 \s-1CONTRIBUTORS\s0 \s-1BE\s0 \s-1LIABLE\s0
\&\s-1FOR\s0 \s-1ANY\s0 \s-1DIRECT\s0, \s-1INDIRECT\s0, \s-1INCIDENTAL\s0, \s-1SPECIAL\s0, \s-1EXEMPLARY\s0, \s-1OR\s0 \s-1CONSEQUENTIAL\s0
\&\s-1DAMAGES\s0 (\s-1INCLUDING\s0, \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0, \s-1PROCUREMENT\s0 \s-1OF\s0 \s-1SUBSTITUTE\s0 \s-1GOODS\s0 \s-1OR\s0
\&\s-1SERVICES\s0; \s-1LOSS\s0 \s-1OF\s0 \s-1USE\s0, \s-1DATA\s0, \s-1OR\s0 \s-1PROFITS\s0; \s-1OR\s0 \s-1BUSINESS\s0 \s-1INTERRUPTION\s0) \s-1HOWEVER\s0
\&\s-1CAUSED\s0 \s-1AND\s0 \s-1ON\s0 \s-1ANY\s0 \s-1THEORY\s0 \s-1OF\s0 \s-1LIABILITY\s0, \s-1WHETHER\s0 \s-1IN\s0 \s-1CONTRACT\s0, \s-1STRICT\s0 \s-1LIABILITY\s0,
\&\s-1OR\s0 \s-1TORT\s0 (\s-1INCLUDING\s0 \s-1NEGLIGENCE\s0 \s-1OR\s0 \s-1OTHERWISE\s0) \s-1ARISING\s0 \s-1IN\s0 \s-1ANY\s0 \s-1WAY\s0 \s-1OUT\s0 \s-1OF\s0 \s-1THE\s0 \s-1USE\s0
\&\s-1OF\s0 \s-1THIS\s0 \s-1SOFTWARE\s0, \s-1EVEN\s0 \s-1IF\s0 \s-1ADVISED\s0 \s-1OF\s0 \s-1THE\s0 \s-1POSSIBILITY\s0 \s-1OF\s0 \s-1SUCH\s0 \s-1DAMAGE\s0.
.SH "LAST MODIFICATION"
.IX Header "LAST MODIFICATION"
2005/03/22